Extrusion & Post
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LDPE Film Gel Particles and Gels
Problem Phenomenon
Transparent small particles and fish-eyes are scattered on the film surface, becoming white spot defects during printing and laminating.
Cause Analysis
Unplasticized particles, high-melting-point gels, or degraded material in the raw material enter the film; insufficient screw plasticizing and mixing, inadequate screen precision, or screen damage all let gel particles pass.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Improve screen precision and replace regularly; ②Optimize the screw mixing section design; ③Clean out accumulated material in die dead spots; ④Strengthen raw material inspection and management.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Gel particle control relies on three defense lines: plasticizing, filtration, and cleanliness; for high-end packaging film, it is recommended to use finer screens and shorten the replacement cycle.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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